Aeroplane



F. H. JACOBS AEROPLANE l y Filed June 27, 1925 sheen-sheet l2 may -4 1926.

ull/1 l .a I l l l l l l I l `AoRNEY.

z, sheets-sheer s INVENTOR.

ATTORNEY/s.

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`ly receive thrust blocks ll previously described. l The rear v. spars of the wings are guided in plates 9secured in the fuselage, having slots 10 to guidingcarrying the spars. These rear spars 5"` are operated in a manner described in connection with` the preferred form, that is, through the provision of a quadrant 12, having avracl; edge 13 engaged by a pinion 14 on thel shaft of a hand wheel 15. The guadrai'it has an arm 16 connected bya link 17 with the thrust blocks ll.

parent that the operator. may; change--vthe angle of incid-ence of thewings atrwill, 1ncreasmg tlns angle in 'order to-,secure a greater lifting power to permit,v for example,v the machine landing-or leavingtheground at a speed lowerY than:ordinarilyr necessary,r and therefore safer,orito Vp e'llifit,the n1achine to carry and support a `greater load.

When fi ino the anOle of incidence 'can beV y b5 O v 'reduced to the lminimum to lavoidhead `re sistan'ce and thereforey permitagreater fly# ing` speed -i -v .In Figs. 4 and5,'I have'shown a construction including a wing flap, which is ad ff justableat the will of the operatorto vary the vacuum effect on the upper su'rface of thawing, to therebv vary the lifting Ypower' u The wing flaplS, which extends substantially Ione-third the horizontal dimension of the vi ngj longitu dinally of `the fuselage, ia-n'lfsubstantiallY from the inner edge of the wing to the point adjacent the tip, is formed of material similar to the wing` and is suitably braced to provide a substantially rigid stiructure The flap isI pivotally or movablysupported at' the leadingedge of the wing as at 19,and in rear of such edge 1s provided with 4fixed depending arms 20, which are adapted for adlinstable connection with arms Qllprojecting from a shaft 22 rotatably supported longitudinally of the wing, preferably in bearings carried byv the Vforward wing spar. The end of the shaft 22 projects within the fuselage and'is there connected-with a hand lever ;3. adapted for locking engagement through the usual dog and segment 2st with a sector The construction permits the operator through manipulation of the hand lever 23 to swing` the 'flap about its pivotal support llto raise said flap relative to the wing surface and ythereby in effect increase the thicknessof; the forward portion of the fwing. This tends to an increase ofsuction on the upper surface of the wing, and obviously increases the lifting power of the wing.

The wings are designed to be provided with the flaps described. and through an obvious. mechanical e.\:pedient` not necessary to be illustrated or specifically described, the hand lever may be adapted to simultaneously control all flaps,l or if desired, each flap may be independently controlled, the invention contemplating either V.or both ar- .11@ gement-s.

A ris understood, the hlifting power of an aeroplane wing V1s resultant n1 part by the pressure of the air on the underneath suring power. As the wing flap lies fiat on the A w top of the upper wing surface 1n normal In-.either form ofthe devcefityis -ip-- position; the lifting power of the aeroplane is that of the designed' wing, but with the flap adjusted so that its rear free-edge is raised above' the surface of the wing, the thickness of the wing throughout 'the area ofthe flap isincreasefhcorrespondingly increasing the partial vacuum above the upper wing surface, with themesult .fto create af greater suctionorlift.V `The control of the lifting power being thus' in la measure with-l l in the judgment of the-operator, it'is apparent that lthe take-off may 'be usedl with less speed, the wings may be of thinner construction thanheretofore'possible, and the fixed angle of incidence of the wings may be less than that usually required. These results directly flow from the use of the flap described, as in'thel use of 'such flap, the lifting powerr ofv the,. aeroplane may be governed in accordance with-conditions, while in flight with the flap in normal posi.- tion, less head resistancejisj encountered and the flyingA speed per' unit of -horsel powerv is necessarily greater. -Y

Claims:V .,-jy A, :lain a bipl-ane, 'means for pivotally supporting the leadingledge ofthe upper wing, a forward strut connecting the upper and lower wing, means for' guiding the connection of the `strut l and lower wing at the 'leading edge of the latter to permit a predetermined swinging move-. ment of such point, a rear strut connecting the upper and. lower wings,lmeans for guid- 'ing the p'o'int of the pivotal connect-ion between said strut and lower wing to compel a. predetermined movement of such point, and means connected 'tol the lower wing for compelling and limiting movementof both wings. v

In a biplane, means for pivotally supporting' the leading edge of the upper wing, a forward strut connect-ing the upper and lower wings, means for guidingthe connection of the strut and lower wing at the leading edge of the latter to permit a prede termined swinging movement of such point in a substantially horizontal plane, a rear strut connecting the upper and lower wings. means for guiding the point of the pivotal connection between said strut and lower wing to compel a predetermined movement of such point in a plane inclined tovthe horizontal, and means connect-ed to the lower Wing Jfor compelling and limiting movement of bot-h Wings. f

3. )1n aeroplane Wng, a den plvotally Connected to the leading edge thereof, 'a shaft rotatably supported on one of the transverse Spars of the Wing, arms depending from the flap rearwardly of the pivotal from the shaft edge, and links projecting and an operatand connected to said arms,

infr lever secured to one end of the shaft.

a flap' pvot'ally 4. An aeroplane Wing,

connected to the leading edge thereof, a shaft rotatably supported on one of the transverse Spare of the Wing, arms depending from the flap rearwardly of the pivotal edge, and links projecting from the shaft and adjnstably connected to said arms, and

an operating lever secured to one end of the shaft.

In testimony whereof I allx my signe,- ture.

FRANK H. JACOBS. [L 5.] 

